Container with a unitary but removable closure and method and ap

Details Container with a unitary but removable closure and method and ap Container with a unitary but removable closure and method and ap

1985-07-29

1987-06-09

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Female mold and means to shape parison directly by internal...

Forming baffle, bottleneck, or handle

264524, 264540, 425532, 425535, B29C 4904

Patent

active

046717633

ABSTRACT:
A method and apparatus are provided for molding a container such as an ampoule with a hermetically sealed top or closure joined to the upper portion of the container with a peripheral frangible web. Main mold halves defining a cavity are provided with an inwardly projecting portion that defines an upwardly facing bearing surface and a forming edge. A mandrel is provided with at least a downwardly facing first frustoconical sealing surface and with a frustoconical engaging surface extending downwardly and inwardly from the downwardly facing first frustoconical sealing surface. The mandrel is adapted to be positioned in a length of parison extending from the main mold means to temporarily seal the parison opening during vacuum or blow forming of the container. The parison is engaged and pressed by the mandrel against the main mold means upwardly facing bearing surface to effect a temporary sealing of at least the mandrel against the parison and to effect a compression of the parison between the mandrel and the forming edge of the main mold means to form a reduced thickness section of parison which, upon subsequent retraction of the mandrel means and upon subsequent formation of the sealed top of the container, defines a peripheral frangible web below the sealed container top.

REFERENCES:
patent: 3597793 (1971-08-01), Weiler et al.
patent: 3919374 (1975-11-01), Komendowski
patent: 4239726 (1980-12-01), Weiler et al.

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